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Ti3C2Tx-coated g-C3N4 composite material as well as preparation method and application thereof

A composite material, g-c3n4 technology, applied in the field of Ti3C2Tx@g-C3N4 composite material and its preparation, can solve the problems of irreversible capacity loss, inability to protect lithium metal from continuous corrosion, uncontrollable growth of lithium dendrites, etc.

Pending Publication Date: 2022-04-12
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte-derived SEI cannot protect Li metal from the continuous corrosion of the electrolyte, which eventually leads to the uncontrollable growth of Li dendrites and irreversible capacity loss.

Method used

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  • Ti3C2Tx-coated g-C3N4 composite material as well as preparation method and application thereof
  • Ti3C2Tx-coated g-C3N4 composite material as well as preparation method and application thereof
  • Ti3C2Tx-coated g-C3N4 composite material as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0037] The present invention also provides the Ti described in the above-mentioned technical scheme 3 C 2 T x @g-C 3 N 4 The preparation method of composite material, comprises the following steps:

[0038] Ti 3 C 2 T x Nanosheets, carbon nitride precursors and water are mixed to obtain a mixed dispersion; the Ti 3 C 2 T x The mass ratio of nanosheets and carbon nitride precursors is 1:3-9;

[0039] Freezing and drying the mixed dispersion in sequence to obtain a solid composite;

[0040] Calcining the solid composite to obtain Ti 3 C 2 T x @g-C 3 N 4 composite material.

[0041] The invention prepares Ti by self-assembly and in-situ calcination reaction 3 C 2 T x @g-C 3 N 4 Composite materials, during the self-assembly process, carbon nitride precursors are deposited on Ti 3 C 2 T x Nanosheet surface, so that the carbon nitride precursor is uniformly distributed on the Ti 3 C 2 T x Nanosheet surface; during calcination, carbon nitride precursors con...

Embodiment 1

[0055] (1) Ti 3 C 2 T x Synthesis of Nanosheets.

[0056] Add 0.8g lithium fluoride to 10mL hydrochloric acid solution (concentration: 9mol / L), stir for 10min; then add 0.5gTi 3 AlC 2 Slowly added to the above solution, stirred for 24h; washed with deionized water until the pH value of the filtrate was 6; centrifuged at 3500rpm for 1h to obtain a stable suspension; put the suspension at a low temperature of -40°C Freeze for 12 hours, and then dry for 50 hours under a vacuum environment of 5Pa to obtain dry and fluffy black Ti 3 C 2 T x Nanosheets.

[0057] (2) Ti 3 C 2 T x - Synthesis of DCD complex.

[0058] 100mg of the Ti 3 C 2 T x The nanosheets were dispersed in 50 mL of deionized water, 500 mg of dicyandiamide (DCD) was added, and stirred for 3 hours to obtain a mixed dispersion; the mixed dispersion was frozen at a low temperature of -40°C for 12 hours, and then placed in a vacuum environment of 5 Pa Dry for 50h to get Ti 3 C 2 T x - DCD complex.

[0...

Embodiment 2

[0062] It is basically the same as Example 1, except that the amount of DCD is adjusted from "500mg" to "700mg".

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Abstract

The invention provides a Ti < 3 > C < 2 > T < x >-g-C < 3 > N < 4 > composite material as well as a preparation method and application thereof, and relates to the technical field of composite materials. The Ti < 3 > C < 2 > T < x > (at) g-C3N4 composite material provided by the invention has excellent cycle stability, when the Ti < 3 > C < 2 > T < x > (at) g-C3N4 composite material provided by the invention is applied to a lithium metal negative electrode, a three-dimensional Ti < 3 > C < 2 > T < x > framework is used as a lithium metal deposition substrate of a three-dimensional structure, and a g-C3N4 layer on the surface is used as a uniform artificial solid electrolyte interface (SEI), so that the interface stability of the lithium metal negative electrode can be improved, and the lithium metal negative electrode can be applied to a lithium battery. The electrochemical performance is improved.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a Ti 3 C 2 T x @g-C 3 N 4 Composite materials and their preparation methods and applications. Background technique [0002] At present, commercial lithium-ion batteries use graphite as the negative electrode, and the theoretical specific capacity is 372mAh / g. However, with the increasing demand for energy in industries such as portable electronic products and electric vehicles, it is particularly critical to develop storage systems with high energy density. Lithium metal has the highest theoretical specific capacity (3860mAh / g) and the lowest electrochemical potential (-3.04Vvs.RHE), and has attracted widespread attention as an ideal lithium battery anode material. Despite the unique advantages of rechargeable Li metal batteries, their practical applications still face some technical challenges. Highly active Li reacts spontaneously with organic electrolytes to...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/052B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 宫勇吉赵飞飞
Owner BEIHANG UNIV
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